(function () {
  'use strict';

  function $(id) { return document.getElementById(id); }
  function esc(s) {
    return String(s == null ? '' : s).replace(/[&<>"']/g, c => ({
      '&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'
    }[c]));
  }

  document.addEventListener('DOMContentLoaded', function () {
    if (!window.CassandraSync) return;

    const statusEl = $('sync-status');
    const actionsEl = $('sync-actions');
    const feedbackEl = $('sync-feedback');
    const modal = $('sync-modal');
    const pin1 = $('sync-pin1');
    const pin2 = $('sync-pin2');
    const ack = $('sync-ack');
    const errEl = $('sync-modal-err');

    function setFeedback(msg, ok) {
      feedbackEl.style.color = ok ? 'var(--positive)' : '';
      feedbackEl.textContent = msg || '';
    }
    // External callers (the Import section above) can pass a callback
    // that fires after a successful enable-and-push.
    let pendingOnSuccess = null;
    function openModal(opts) {
      pendingOnSuccess = (opts && opts.onSuccess) || null;
      modal.style.display = 'flex';
      // Focus PIN field after the layout flush so the caret lands.
      setTimeout(() => pin1.focus(), 0);
    }
    function closeModal() {
      modal.style.display = 'none';
      pin1.value = ''; pin2.value = '';
      ack.checked = false; errEl.hidden = true;
      pendingOnSuccess = null;
    }

    $('sync-modal-cancel').addEventListener('click', closeModal);
    // Backdrop click + Esc key dismiss the modal.
    modal.addEventListener('click', function (e) {
      if (e.target === modal) closeModal();
    });
    document.addEventListener('keydown', function (e) {
      if (e.key === 'Escape' && modal.style.display !== 'none') closeModal();
    });

    $('sync-modal-form').addEventListener('submit', async function (e) {
      e.preventDefault();
      errEl.hidden = true;
      if (pin1.value !== pin2.value) {
        errEl.textContent = 'PINs do not match.';
        errEl.hidden = false; return;
      }
      if (pin1.value.length < 4) {
        errEl.textContent = 'PIN must be at least 4 characters.';
        errEl.hidden = false; return;
      }
      const pie = JSON.parse(localStorage.getItem('cassandra.pie') || 'null');
      if (!pie) {
        errEl.textContent =
          'No portfolio in this browser yet. Import a CSV first, then enable sync.';
        errEl.hidden = false; return;
      }
      try {
        await window.CassandraSync.pushSync(pie, pin1.value);
        const cb = pendingOnSuccess;
        closeModal();   // clears pendingOnSuccess
        await refresh();
        setFeedback('Cloud sync enabled. Your encrypted portfolio is stored.', true);
        if (typeof cb === 'function') {
          try { cb(); } catch (cbErr) { console.warn('sync onSuccess threw', cbErr); }
        }
      } catch (e2) {
        errEl.textContent = e2.message || 'Failed to enable sync.';
        errEl.hidden = false;
      }
    });

    async function refresh() {
      let status;
      try { status = await window.CassandraSync.getStatus(); }
      catch (e) {
        statusEl.querySelector('.settings-row__value').innerHTML =
          '<span class="pf-warn">' + esc(e.message || 'status check failed') + '</span>';
        return;
      }
      const valueEl = statusEl.querySelector('.settings-row__value');
      actionsEl.innerHTML = '';
      if (status.exists && status.orphaned) {
        // The stored blob can no longer be decrypted (server key rotated
        // since it was written). The data is permanently unrecoverable,
        // so silently clean up the dead row and re-render in the
        // standard "off" state — leaving a soft one-liner so the user
        // knows why they need to re-import.
        try { await window.CassandraSync.disableSync(); }
        catch (e) { console.warn('auto-clear stale sync failed', e); }
        setFeedback('Your previous cloud backup couldn’t be restored. Re-import your portfolio to enable cloud sync again.', true);
        await refresh();
        return;
      } else if (status.exists) {
        const when = status.updated_at
          ? new Date(status.updated_at).toISOString().replace('T', ' ').slice(0, 16) + ' UTC'
          : '—';
        valueEl.innerHTML =
          '<span class="badge badge--ok">On</span> ' +
          '<span class="settings-row__hint">last synced ' + esc(when) + '</span>';

        const disable = document.createElement('button');
        disable.type = 'button';
        disable.className = 'pf-secondary';
        disable.textContent = 'Disable sync';
        disable.addEventListener('click', async function () {
          if (!confirm('Remove your encrypted portfolio from the server? Your local copy is untouched.')) return;
          try {
            await window.CassandraSync.disableSync();
            await refresh();
            setFeedback('Cloud sync disabled. Server copy removed.', true);
          } catch (e) { setFeedback(e.message || 'Disable failed.', false); }
        });
        actionsEl.appendChild(disable);
      } else {
        valueEl.innerHTML = '<span class="badge badge--ver">Off</span>';
        // Only offer 'Enable' when there's actually a pie to encrypt;
        // otherwise the user would hit a dead-end at the modal.
        const hasPie = !!localStorage.getItem('cassandra.pie');
        if (!hasPie) {
          const hint = document.createElement('span');
          hint.className = 'settings-row__hint';
          hint.innerHTML =
            'Nothing to sync yet &mdash; ' +
            '<a href="#import">import a portfolio</a> first, then come back to enable cloud sync.';
          actionsEl.appendChild(hint);
          return;
        }
        const enable = document.createElement('button');
        enable.type = 'button';
        enable.textContent = 'Enable cloud sync';
        enable.addEventListener('click', openModal);
        actionsEl.appendChild(enable);
      }
    }

    // Hooks for the Import section to drive this modal + status row.
    window.cassandraOpenSyncModal    = openModal;
    window.cassandraRefreshSyncStatus = refresh;

    refresh();
  });
})();